| 摘要 |
<p>MUSIC TEACHING APPARATUS Disclosed is a music teaching apparatus comprising a display base, a circular display disc rotatably associated with the base, and a display keyboard moveable relative to the display base. The base has first indicia including a circular array of twelve equally spaced, radially extending, lines and has second indicia spaced from the first indicia, the second indicia including a linear array of thirteen, equally spaced, parallel lines. The disc has third indicia in a circular array, the third indicia representing twelve notes of an octave, which notes are at intervals of two and one-half tones on a musical scale, and the progression of notes, in one direction, being according to 4th intervals and, in the other direction being in accordance with 5th intervals, the notes being angularly spaced for registration with lines of the first indicia. The keyboard provides fourth indicia comprising representation of at least one octave of a piano keyboard including white and black keys, the spacing of the keys coinciding substantially with the spacing of the linear array of lines of the second indicia. Registration of a note from the disc third indicia with a line of the first indicia at the 12 o'clock position, hereinafter denoted as a base note, provides registration of other notes of the third indicia with other lines of the first indicia, and provides information about the prime chords of the base note from the registration of the base note and registration of notes of the other notes in registration with the 1 and 11 o'clock positions. Further registration of a key of the base note as represented on the keyboard fourth indicia with the first line of the second indica provides spacial information as to the prime chords of the base note on the keyboard fourth indicia in registration with the first, sixth and eighth lines from the left of the second indicia.</p> |
